It takes some time to generate (first time it takes about two minutes, after that it is much faster), but then it runs surprisingly well (it is also possible to load smaller models, that generate much faster but with less resolution)…
https://gan.handmadeproductions.de/
Its basically a port of this code: GitHub - alantian/ganshowcase
Edit: There seems to be kind of a memory leak, because the used GPU memory is slowly growing.
I have the same problem with the colorization model, would be nice to fix that…
Edit2: I guess, I solved the memory issue…